Brain, Marshall. "How Car Engines Work." How Stuff Works. Internet. 4 March 2002 http://www.howstuffworks.com/engine.htm

"Engine Efficiency." Engine Efficiency. Internet. 5 May 2002. http://www.tpub.com/engine1/en1-102.htm

"Indicated Horsepower." Horsepower Computation. Internet. 5 May 2002. http://www.tpub.com/engine1/en1-96.htm

"Mechanical Efficiency." Engine Efficiency. Internet. 5 May 2002. http://www.tpub.com/engine1/en1-104.htm

Peters, Eric. "Is a Diesel Worth It." Consumers’ Research Magazine February 2001. EBSCOHost. 4 March 2002.

"Thermal Efficiency." Engine Efficiency. Internet. 5 May 2002. http://www.tpub.com/engine1/en1-103.htm

"Volumetric Efficiency." Engine Efficiency. Internet. 5 May 2002. http://www.tpub.com/engine1/en1-105.htm